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  #1  
Old 25th July 2012, 11:20 AM
Borus Offline
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Fedora 17 - Kernel repeatedly disconnects and connects USB dongle

Hi community,

this is my first post! I've just installed Fedora 17 on an IBM X3550 M3. I'm doing some QEMU/KVM stuff and I need to do pass-through some USB device to my virtualized host.

The USB device is a USB dongle which can not be mounted (it contains just a license key from some customer). I've pluged-in the USB dongle and all I see in /var/log/messages is:

Code:
Jul 25 12:17:53 pscx3550m3 mtp-probe: checking bus 3, device 59: "/sys/devices/pci0000:00/0000:00:1a.0/usb3/3-2"
Jul 25 12:17:53 pscx3550m3 mtp-probe: bus: 3, device: 59 was not an MTP device
Jul 25 12:17:53 pscx3550m3 kernel: [  936.467342] usb 3-2: USB disconnect, device number 59
Jul 25 12:17:53 pscx3550m3 kernel: [  936.673209] usb 3-2: new low-speed USB device number 60 using uhci_hcd
Jul 25 12:17:53 pscx3550m3 kernel: [  936.838710] usb 3-2: New USB device found, idVendor=1672, idProduct=0001
Jul 25 12:17:53 pscx3550m3 kernel: [  936.838715] usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
Jul 25 12:17:53 pscx3550m3 kernel: [  936.838718] usb 3-2: Product: USB Dongle V1.0
Jul 25 12:17:53 pscx3550m3 kernel: [  936.838720] usb 3-2: Manufacturer: xxx
Jul 25 12:17:53 pscx3550m3 mtp-probe: checking bus 3, device 60: "/sys/devices/pci0000:00/0000:00:1a.0/usb3/3-2"
Jul 25 12:17:53 pscx3550m3 mtp-probe: bus: 3, device: 60 was not an MTP device
Jul 25 12:17:53 pscx3550m3 kernel: [  937.022048] usb 3-2: USB disconnect, device number 60
Jul 25 12:17:54 pscx3550m3 kernel: [  937.227861] usb 3-2: new low-speed USB device number 61 using uhci_hcd
Jul 25 12:17:54 pscx3550m3 kernel: [  937.393454] usb 3-2: New USB device found, idVendor=1672, idProduct=0001
Jul 25 12:17:54 pscx3550m3 kernel: [  937.393458] usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
Jul 25 12:17:54 pscx3550m3 kernel: [  937.393462] usb 3-2: Product: USB Dongle V1.0
Jul 25 12:17:54 pscx3550m3 kernel: [  937.393464] usb 3-2: Manufacturer: xxx
Jul 25 12:17:54 pscx3550m3 mtp-probe: checking bus 3, device 61: "/sys/devices/pci0000:00/0000:00:1a.0/usb3/3-2"
Jul 25 12:17:54 pscx3550m3 mtp-probe: bus: 3, device: 61 was not an MTP device
Jul 25 12:17:54 pscx3550m3 kernel: [  937.661808] usb 3-2: USB disconnect, device number 61
Jul 25 12:17:54 pscx3550m3 kernel: [  937.867524] usb 3-2: new low-speed USB device number 62 using uhci_hcd
Jul 25 12:17:54 pscx3550m3 kernel: [  938.033128] usb 3-2: New USB device found, idVendor=1672, idProduct=0001
Jul 25 12:17:54 pscx3550m3 kernel: [  938.033132] usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
Jul 25 12:17:54 pscx3550m3 kernel: [  938.033135] usb 3-2: Product: USB Dongle V1.0
Jul 25 12:17:54 pscx3550m3 kernel: [  938.033138] usb 3-2: Manufacturer: xxx
Jul 25 12:17:54 pscx3550m3 mtp-probe: checking bus 3, device 62: "/sys/devices/pci0000:00/0000:00:1a.0/usb3/3-2"
Jul 25 12:17:54 pscx3550m3 mtp-probe: bus: 3, device: 62 was not an MTP device
Jul 25 12:17:55 pscx3550m3 kernel: [  938.216397] usb 3-2: USB disconnect, device number 62
Jul 25 12:17:55 pscx3550m3 kernel: [  938.422343] usb 3-2: new low-speed USB device number 63 using uhci_hcd
I've also tried adding usbcore.autosuspend=-1 to the boot options. No improvement!

Any ideeas?


Thanks in advance.
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  #2  
Old 26th July 2012, 11:22 AM
Borus Offline
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Join Date: Jul 2012
Location: Romania
Posts: 2
linuxchrome
Re: Fedora 17 - Kernel repeatedly disconnects and connects USB dongle

I've finally managed it to find the source of the whole problem.
Code:
Jul 25 12:17:53 pscx3550m3 mtp-probe: bus: 3, device: 60 was not an MTP device
Since I became skeptical about the "mtp-probe" I looked for it and found it in /lib/udev/mtp-probe. Afterwards I've "disabled" it by
Code:
# mv /lib/udev/mtp-probe /lib/udev/mtp-probe-broken
And it worked! No more disconnects and the device remains visible to the system:
Code:
# lsusb | grep 1672
Bus 003 Device 065: ID 1672:0001
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